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If you can route a shorter belt and do away with the smog pump altogether I would go with that. Otherwise the pumps usually have the main housing with a cover plate bolted to it. You need to get access to the inside of the pump, remove the internals, so that it is not pumping all time.
1 If your old style tank becomes water logged, the pump will run frequently or not turn off at all. There are two ways to fix this.  You can shut off the pump and drain the tank, then turn the pump back on and restore the service.